Im not sure if this will help you, but complexes dont color because of the ligand. Its the number of unpaired electrons present in the central atom. That might help you out, although I dont know how you would go about finding the wavelengths.

Im not sure if this will help you, but complexes dont color because of the ligand. Its the number of unpaired electrons present in the central atom. That might help you out, although I dont know how you would go about finding the wavelengths.

Not so....
Ligands do cause the ion to absorb different wavelengths. The theory you need to refer to is crystal field theory. If you are familiar with the strong or weak field ligands you should be able to answer this. Have you ever discussed "10 Dq" in your lectures?

Remember, something that absorbs in the red will appear green and something that absorbs in the blue will appear yellow.

Not so....
Ligands do cause the ion to absorb different wavelengths. The theory you need to refer to is crystal field theory. If you are familiar with the strong or weak field ligands you should be able to answer this. Have you ever discussed "10 Dq" in your lectures?

Remember, something that absorbs in the red will appear green and something that absorbs in the blue will appear yellow.

10Dq is very like the delta value that is used in Crystal Field Theory. Its magnitude determines if the crystal field is strong or weak and tells you something about the absorbance spectrum of the metal complex.